Use

     Required to open up coal mine roadway pneumatic tools and spray equipment, the supply of compressed air from the ground, the result of a long pipeline, to reduce stress and therefore inefficient. The compressor face in the vicinity of underground tunneling safe operation, and move forward with the roadway extension, it can maintain a higher pressure, so that the efficiency of mechanical air supply than when the ground by 30% to double the decline in consumption 30%, and can save substantial pipeline. The compressor also applies to use of roadway construction projects.